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TS27M4ACD CMOS Amplifier Equivalent & Substitute Parts
Part Overview
The TS27M4ACD is a CMOS amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit operational amplifier in a 14-SOIC surface mount package. This device is classified as obsolete, indicating discontinued production and limited availability for new designs. The TS27M4ACD operates across a supply voltage range of 3V to 16V with a slew rate of 0.6V/µs and gain bandwidth product of 1 MHz, making it suitable for low-speed, low-power analog signal processing applications.
Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, component sourcing, and long-term product support. Substitute parts must maintain compatibility with the original electrical specifications, mechanical packaging, and thermal operating range to ensure functional equivalence in existing circuit designs.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | CMOS | — |
| Number of Circuits | 4 | — |
| Slew Rate | 0.6 | V/µs |
| Gain Bandwidth Product | 1 | MHz |
| Current - Input Bias | 1 | pA |
| Voltage - Input Offset | 900 | µV |
| Current - Supply (x4 Channels) | 150 | µA |
| Current - Output / Channel | 45 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 16 | V |
| Operating Temperature | 0 to 70 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the TS27M4ACD is determined by strict adherence to the following electrical and mechanical parameters:
Critical Matching Parameters:
- Number of circuits: 4 channels required
- Package type: 14-SOIC surface mount form factor
- Supply voltage range: Minimum 3V to maximum 16V
- Input bias current: 1 pA specification
- Output current per channel: 45 mA capability
- Operating temperature range: 0°C to 70°C minimum
- RoHS3 compliance and MSL Level 1 rating
Substitution Logic: Substitute parts are grouped into two categories based on amplifier type classification:
-
CMOS Amplifier Substitutes (TLC1079 Series): Parts maintaining the CMOS amplifier type with identical 4-circuit configuration and 14-SOIC packaging. These devices feature lower slew rates (0.032V/µs) and reduced gain bandwidth product (110 kHz), representing lower-performance alternatives suitable for applications not requiring the original device's bandwidth specifications.
-
General Purpose Amplifier Substitutes (TLC274 Series): Parts classified as general-purpose operational amplifiers with 4-circuit configuration and 14-SOIC packaging. These devices offer higher slew rates (3.6V/µs) and increased gain bandwidth product (2.2 MHz), representing higher-performance alternatives suitable for applications requiring enhanced frequency response.
All substitute parts maintain the 14-SOIC package geometry, surface mount mounting type, and RoHS3 compliance status. Supply voltage ranges and output current capabilities remain compatible with the original specification.
Parameter Comparison
| Parameter | TS27M4ACD | TLC1079CD | TLC1079CDR | TLC1079ID | TLC1079IDR | TLC274ACD | TLC274ACDR | TLC274AIDR | TLC274BCD | TLC274BCDR | TLC274BIDR |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | STMicroelectronics | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Number of Circuits | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Amplifier Type | CMOS | CMOS | CMOS | CMOS | CMOS | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose |
| Slew Rate (V/µs) | 0.6 | 0.032 | 0.032 | 0.032 | 0.032 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 |
| Gain Bandwidth Product (MHz) | 1 | 0.11 | 0.11 | 0.11 | 0.11 | 2.2 | 2.2 | 2.2 | 2.2 | 2.2 | 2.2 |
| Current - Input Bias (pA) | 1 | 1 | 1 | 1 | 1 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 |
| Voltage - Input Offset (µV) | 900 | 180 | 180 | 180 | 180 | 900 | 900 | 900 | 340 | 340 | 340 |
| Current - Supply (µA, x4 Channels) | 150 | 29 | 29 | 29 | 29 | 2700 | 2700 | 2700 | 2700 | 2700 | 2700 |
| Current - Output / Channel (mA) | 45 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
| Voltage - Supply Span Min (V) | 3 | 1.4 | 1.4 | 3 | 3 | 3 | 3 | 4 | 3 | 3 | 4 |
| Voltage - Supply Span Max (V) | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 |
| Operating Temperature (°C) | 0 to 70 | 0 to 70 | 0 to 70 | -40 to 85 | -40 to 85 | 0 to 70 | 0 to 70 | -40 to 85 | 0 to 70 | 0 to 70 | -40 to 85 |
| Package / Case | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Obsolete | Active | Last Time Buy | Last Time Buy | Active | Obsolete | Active | Active | Obsolete | Active | Active |
Engineering Selection Recommendations
CMOS Amplifier Substitutes (TLC1079 Series):
The TLC1079 series from Texas Instruments provides direct functional substitution for the TS27M4ACD within the CMOS amplifier category. All variants maintain the 4-circuit configuration, 14-SOIC package geometry, and surface mount mounting type. The TLC1079IDR variant is recommended as the primary substitute due to its active product status, ensuring long-term availability and supply chain continuity. This part maintains compatibility with the original 3V to 16V supply voltage range and 0°C to 70°C operating temperature specification.
The TLC1079CD and TLC1079CDR variants are suitable for applications with identical thermal operating requirements (0°C to 70°C). The TLC1079ID and TLC1079IDR variants extend the operating temperature range to -40°C to 85°C, providing enhanced thermal performance for demanding environments.
All TLC1079 variants feature reduced slew rate (0.032V/µs versus 0.6V/µs) and lower gain bandwidth product (110 kHz versus 1 MHz), resulting in significantly lower power consumption (29µA total supply current versus 150µA). These characteristics make the TLC1079 series suitable for ultra-low-power applications where bandwidth requirements do not exceed 110 kHz.
General Purpose Amplifier Substitutes (TLC274 Series):
The TLC274 series from Texas Instruments provides higher-performance substitution for the TS27M4ACD. These general-purpose operational amplifiers maintain the 4-circuit configuration and 14-SOIC package geometry while offering enhanced frequency response characteristics. The TLC274ACDR and TLC274BCDR variants are recommended as primary substitutes due to their active product status and tape-and-reel packaging for automated assembly.
The TLC274AIDR and TLC274BIDR variants extend the operating temperature range to -40°C to 85°C and increase the minimum supply voltage to 4V, providing enhanced thermal and electrical performance for demanding applications.
All TLC274 variants feature significantly higher slew rate (3.6V/µs versus 0.6V/µs) and increased gain bandwidth product (2.2 MHz versus 1 MHz), enabling applications requiring faster signal processing. However, these devices consume substantially higher supply current (2.7mA total versus 150µA), requiring careful power budget evaluation.
Compliance and Certification:
All substitute parts maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity) ratings, ensuring compatibility with modern manufacturing processes and long-term storage requirements. All devices are classified under ECCN EAR99 and HTSUS 8542.33.0001, maintaining identical regulatory classification with the original TS27M4ACD.
Frequently Asked Questions (FAQ)
Q: Can the TLC1079 series directly replace the TS27M4ACD in existing designs?
A: The TLC1079 series maintains mechanical and electrical compatibility with the TS27M4ACD within the constraints of the specified parameters. Both are 4-circuit CMOS amplifiers in 14-SOIC packages with identical supply voltage ranges (3V to 16V) and operating temperature ranges (0°C to 70°C for standard variants). However, the TLC1079 features significantly lower slew rate (0.032V/µs versus 0.6V/µs) and gain bandwidth product (110 kHz versus 1 MHz). Substitution is appropriate only for applications where these reduced performance characteristics are acceptable.
Q: What are the key differences between the TLC1079 and TLC274 substitute families?
A: The TLC1079 series maintains the CMOS amplifier classification with low power consumption (29µA total supply current) and reduced bandwidth (110 kHz gain bandwidth product). The TLC274 series is classified as general-purpose operational amplifiers with higher power consumption (2.7mA total supply current) and enhanced bandwidth (2.2 MHz gain bandwidth product). Selection between these families depends on application bandwidth requirements and power budget constraints.
Q: Are all TLC1079 variants electrically equivalent?
A: All TLC1079 variants (CD, CDR, ID, IDR) share identical electrical specifications for slew rate, gain bandwidth product, input bias current, input offset voltage, and supply current. The primary differences are packaging format (tube versus tape-and-reel) and operating temperature range. The CD and CDR variants operate from 0°C to 70°C, while the ID and IDR variants operate from -40°C to 85°C. The CDR and IDR variants are supplied in tape-and-reel format for automated assembly, while CD and ID variants are supplied in tube packaging.
Q: Are all TLC274 variants electrically equivalent?
A: The TLC274 series includes two performance grades: TLC274A and TLC274B. The TLC274A variants feature 900µV input offset voltage, while TLC274B variants feature 340µV input offset voltage. All other electrical specifications (slew rate, gain bandwidth product, supply current, output current) are identical across both grades. Operating temperature ranges vary: CD, CDR, BCD, and BCDR variants operate from 0°C to 70°C, while AIDR and BIDR variants operate from -40°C to 85°C. Packaging formats vary between tube (CD, BCD) and tape-and-reel (ACDR, AIDR, BCDR, BIDR).
Q: What is the significance of the minimum supply voltage difference between TLC1079CD/CDR and TLC1079ID/IDR?
A: The TLC1079CD and TLC1079CDR variants specify a minimum supply voltage of 1.4V, while the TLC1079ID and TLC1079IDR variants specify a minimum supply voltage of 3V. For applications requiring operation at the TS27M4ACD's specified minimum of 3V, both variant groups are compatible. Applications requiring operation below 3V must use the TLC1079CD or TLC1079CDR variants.
Q: What is the significance of the minimum supply voltage difference between TLC274ACD/ACDR/BCD/BCDR and TLC274AIDR/BIDR?
A: The TLC274ACD, ACDR, BCD, and BCDR variants specify a minimum supply voltage of 3V, matching the TS27M4ACD specification. The TLC274AIDR and BIDR variants specify a minimum supply voltage of 4V. For applications requiring operation at 3V, the standard temperature-range variants (ACD, ACDR, BCD, BCDR) are required. The extended temperature-range variants (AIDR, BIDR) are suitable only for applications with minimum supply voltages of 4V or higher.
Q: How does the output current specification affect substitution decisions?
A: The TS27M4ACD specifies 45mA output current per channel, while all substitute parts (both TLC1079 and TLC274 series) specify 30mA output current per channel. Applications requiring output currents exceeding 30mA per channel cannot use these substitute parts. Applications requiring 30mA or less per channel are compatible with all substitute options.
Q: What packaging considerations apply to substitute part selection?
A: All substitute parts maintain the 14-SOIC (0.154", 3.90mm width) surface mount package geometry, ensuring mechanical compatibility with existing PCB layouts and assembly equipment. Packaging format differences (tube versus tape-and-reel) affect only the supply and handling process, not the electrical or mechanical characteristics of the component itself. Tape-and-reel variants (CDR, ACDR, AIDR, BCDR, BIDR) are optimized for automated assembly, while tube variants (CD, ACD, BCD, ID) are suitable for manual or semi-automated assembly.
Q: Which substitute part offers the best long-term availability?
A: The TLC1079IDR and TLC274ACDR variants are classified as active products, indicating ongoing production and long-term availability. The TLC1079CDR is classified as last-time-buy, indicating limited remaining production. The TLC1079CD, TLC274ACD, and TLC274BCD variants are classified as obsolete, indicating discontinued production. For new designs requiring long-term component availability, the TLC1079IDR or TLC274ACDR variants are recommended.
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